Electron tube with dispenser cathode

Details Electron tube with dispenser cathode Electron tube with dispenser cathode

1977-05-27

1979-08-21

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

252514, 252521, 313337, 313346DC, H01J 114, H01J 1406

Patent

active

041654730

ABSTRACT:
The performance of microwave tubes at very high frequencies is limited by the ability of their thermionic cathodes to provide high emission current density in combination with long life and low evaporation of active material. An improved tube uses a cathode comprising a porous metal matrix consisting of a compacted mixture of tungsten and iridium particles, impregnated with a molten barium aluminate. Other alkaline earth oxides may be used as additives. The impregnated cathode outgasses easily and has a long life because it is not dependent on thin surface films. Thermionic emission is improved compared to a tungsten matrix, and barium evporation is reduced. The combination of power and frequency obtainable from the microwave tube is thereby significantly increased.

REFERENCES:
patent: 2902620 (1959-09-01), Winter
patent: 3139541 (1964-06-01), Henderson et al.
patent: 3155864 (1964-11-01), Coppola
patent: 3437865 (1969-04-01), Gabor et al.
patent: 3497757 (1970-02-01), Zalm et al.

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